M2 laminated tool steel stays sharper and lasts longer than conventional knife materials Vacuum heat treating provides longer blade life before user needs to flip to the second side New grinding process provides longer life with fewer nicks The DW7352-2 13" Vacuum Heat Treated Double Sided Two Pack Replacement Planer Knives are made of M2 laminated tool steel for long-lasting sharpness. Vacuum heat treating and our new grinding process provides long blade life with fewer knicks.
